/*
** JNetLib
** Copyright (C) 2000-2001 Nullsoft, Inc.
** Author: Justin Frankel
** File: udpconnection.h - JNL UDP connection interface
** License: see jnetlib.h
**
** Usage:
** 1. Create a JNL_Connection object, optionally specifying a JNL_AsyncDNS
** object to use (or NULL for none, or WAC_NETWORK_CONNECTION_AUTODNS for auto),
** and the send and receive buffer sizes.
** 2. Call connect() to have it connect to a host/port (the hostname will be
** resolved if possible).
** 3. call run() with the maximum send/recv amounts, and optionally parameters
** so you can tell how much has been send/received. You want to do this a lot, while:
** 4. check get_state() to check the state of the connection. The states are:
** JNL_Connection::STATE_ERROR
** - an error has occured on the connection. the connection has closed,
** and you can no longer write to the socket (there still might be
** data in the receive buffer - use recv_bytes_available()).
** JNL_Connection::STATE_NOCONNECTION
** - no connection has been made yet. call connect() already! :)
** JNL_Connection::STATE_RESOLVING
** - the connection is still waiting for a JNL_AsycnDNS to resolve the
** host.
** JNL_Connection::STATE_CONNECTING
** - the asynchronous call to connect() is still running.
** JNL_Connection::STATE_CONNECTED
** - the connection has connected, all is well.
** JNL_Connection::STATE_CLOSING
** - the connection is closing. This happens after a call to close,
** without the quick parameter set. This means that the connection
** will close once the data in the send buffer is sent (data could
** still be being received when it would be closed). After it is
** closed, the state will transition to:
** JNL_Connection::STATE_CLOSED
** - the connection has closed, generally without error. There still
** might be data in the receieve buffer, use recv_bytes_available().
** 5. Use send() and send_string() to send data. You can use
** send_bytes_in_queue() to see how much has yet to go out, or
** send_bytes_available() to see how much you can write. If you use send()
** or send_string() and not enough room is available, both functions will
** return error ( < 0)
** 6. Use recv() and recv_line() to get data. If you want to see how much data
** there is, use recv_bytes_available() and recv_lines_available(). If you
** call recv() and not enough data is available, recv() will return how much
** data was actually read. See comments at the function defs.
**
** 7. To close, call close(1) for a quick close, or close() for a close that will
** make the socket close after sending all the data sent.
**
** 8. delete ye' ol' object.
*/
#ifndef _UDPCONNECTION_H_
#define _UDPCONNECTION_H_
#include "asyncdns.h"
#include "nu/RingBuffer.h"
#include "jnetlib_defines.h"
#define JNL_DEFAULT_BUFFER_SIZE 8192
class JNL_UDPConnection : private Drainer, private Filler
{
public:
typedef enum
{
STATE_ERROR = JNL_CONNECTION_STATE_ERROR,
STATE_NOCONNECTION = JNL_CONNECTION_STATE_NOCONNECTION,
STATE_RESOLVING = JNL_CONNECTION_STATE_RESOLVING,
STATE_CONNECTING = JNL_CONNECTION_STATE_CONNECTING,
STATE_CONNECTED = JNL_CONNECTION_STATE_CONNECTED,
STATE_CLOSING = JNL_CONNECTION_STATE_CLOSING,
STATE_CLOSED = JNL_CONNECTION_STATE_CLOSED,
STATE_RESOLVED = JNL_CONNECTION_STATE_RESOLVED,
} state;
JNL_UDPConnection();
JNL_UDPConnection( unsigned short port, JNL_AsyncDNS *dns, int sendbufsize = JNL_DEFAULT_BUFFER_SIZE, int recvbufsize = JNL_DEFAULT_BUFFER_SIZE );
~JNL_UDPConnection();
void open( JNL_AsyncDNS *dns = JNL_AUTODNS, size_t sendbufsize = JNL_DEFAULT_BUFFER_SIZE, size_t recvbufsize = JNL_DEFAULT_BUFFER_SIZE );
void open( int incoming_socket, JNL_AsyncDNS *dns = JNL_AUTODNS, size_t sendbufsize = JNL_DEFAULT_BUFFER_SIZE, size_t recvbufsize = JNL_DEFAULT_BUFFER_SIZE );
void setpeer( const char *hostname, int port );
void setpeer( sockaddr *addr, socklen_t length /* of addr */ );
void run( size_t max_send_bytes = -1, size_t max_recv_bytes = -1, size_t *bytes_sent = NULL, size_t *bytes_rcvd = NULL );
int get_state() { return m_state; }
const char *get_errstr() { return m_errorstr; }
void close( int quick = 0 );
void flush_send( void ) { send_buffer.clear(); }
size_t send_bytes_in_queue( void );
size_t send_bytes_available( void );
int send( const void *data, size_t length ); // returns -1 if not enough room
int send_string( const char *line ); // returns -1 if not enough room
size_t recv_bytes_available( void );
size_t recv_bytes( void *data, size_t maxlength ); // returns actual bytes read
unsigned int recv_int( void );
int recv_lines_available( void );
int recv_line( char *line, size_t maxlength ); // returns 0 if the line was terminated with a \r or \n, 1 if not.
// (i.e. if you specify maxlength=10, and the line is 12 bytes long
// it will return 1. or if there is no \r or \n and that's all the data
// the connection has.)
size_t peek_bytes( void *data, size_t maxlength ); // returns bytes peeked
int get_interface( sockaddr *sin, socklen_t *sin_length ); // this returns the interface the connection is on
short get_remote_port( void ) { return m_remote_port; } // this returns the remote port of connection
void get_last_recv_msg_addr( sockaddr **addr, socklen_t *len ) { *addr = (sockaddr *)&m_last_addr; *len = m_last_addr_len; }
void set_ttl( uint8_t new_ttl );
protected:
uint8_t ttl;
SOCKET m_socket;
unsigned short m_remote_port;
RingBuffer recv_buffer;
RingBuffer send_buffer;
sockaddr *address;
socklen_t address_len;
sockaddr_storage m_last_addr;
socklen_t m_last_addr_len;
addrinfo *saddr;
char *m_host;
JNL_AsyncDNS *m_dns;
int m_dns_owned;
state m_state;
const char *m_errorstr;
private:
void init(); // constructor helper function
// functions for RingBuffer
size_t Read( void *dest, size_t len );
size_t Write( const void *dest, size_t len );
};
#endif // _UDPConnection_H_